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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f235c6d5b1dbe3a881e2607ba3e0c465a66f6c79b7b3e2254652c19039e854f4' 
  AND token = 'hP7e4DfCvtKJg1KaOViJcup3Wt9/4spmS3372wGfHRk=' 
  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"
    }
  }
}