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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2ff8749ffbec3619a0beee7d5efc50053155d3963863932508d36a18fcbcc7' 
  AND token = 'Hmcnp37EfEMN0XTXQyPz07Ydk/4OKVo5Ayl1xa0lTLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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