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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1f8d5a64b1545be93fcd9079b28dcb7c64889d938d56be6306cf7ebd1447ae' 
  AND token = '+pORm4LHp5rtuUgdVs768kE250Hw6tIwLWTt1kn0df4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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