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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f5a27753bc752fce9040b73c2f96f614171b9b9c5288b3633496db47450b1' 
  AND token = 'NqTuQMPWg6pTYcgczgzDCc5g6YLi5/116XUz9YW5O6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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