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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739d46ad988d9b652bc279243ab8d7d3f3447c651fe44fe521a4c67169db9bbd' 
  AND token = 'nmbl6TzcaEplCNRONwh8Es/uMjsEYLFm21AdAeDU0mc=' 
  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"
    }
  }
}