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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fbcd15820460a8e7b6d9caf85b76996239a180aa539c2d988f3be39bafaba5' 
  AND token = '75vZ4p6Y0S2Kon9O8Cv3evg689QG07BID6pka0lbrhE=' 
  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"
    }
  }
}