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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d75bf29c9be7a13426145e51e27c2b1273cc22cd14eff7d32267ac021094bbb' 
  AND token = '8ZKOLyZ50BH0uAICJuGn8Aqhpq7Nfiw/W1fyq/M7fLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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