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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac20a94a49fe4ccb8e35c4cfe09436cbe0cd2cc3eb29eddcb785d09a5757259' 
  AND token = 'vDqV0yyBjkBw1QaZfLpCWfcBOCMPmERrP20/WyuNklc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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