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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe70d56f1973bbac17cf7677a51b69c624102bc7d9e38271b4b9432e7d00703f' 
  AND token = '87g0z7yWcBqsp8rQELeTXsMz8DkA2k9ofKSXh/IpX4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}