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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e8372af5ef777e523e7a18434504e6b0d4e8933ce6a93e17b2b193cbf02280' 
  AND token = 'zmVblMv0Hkamt0oim/hxmqcWq+yz5zBVkNrnx2KRmHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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