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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7e1fee0500e43ae8ce170ef297d98be84c93d8bda314ea9823406daf55dc18' 
  AND token = 'BiJFXnLUlFn5+ePG1bOt9NSrOz+BcWd+3JOtVzJB18s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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