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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56019ca23f8ac162188157a3da6e20bdf994e7d1963b6e1bb7e110e9a7e0efbb' 
  AND token = 'adq6/7iIAnxzBrV/TVeilxLAW/j5zxIK3pSgp1LAF4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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