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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df1aab72db1ffdcf8d03c3373fad43e5bc28a1a69a04df84ca8e4aa80527e0e' 
  AND token = '4vXkAV4pfC6ZYyTY6Ai5b6eWQoOEiBwYrtnyrBQjquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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