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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50973723e6f40a877ce5eb65ff28ddd9b3fbb42ed2ad281799773abe589989d5' 
  AND token = 'N4rWKHRQ8q8+hc3A6yl9slQDe6gNkh6pBqJr34jpYjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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