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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4384b2131ebef3d0c70c6beb2564471b9a2e16d8f93b4dbf6e83d20badaad65b' 
  AND token = 'KYa91WyqTsodggyS028XvGAkF+MV3fmBrvq+rBgOe5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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