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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32b100af7ae607fc2d8176d40590c5e008185f94cd06faf7fff6a76f74e9813' 
  AND token = 'gYCv2cEohPf9n8xZfc3bPHTt8Ttg0ae2u/K585lPzgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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