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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fb5aad731a4a70fad3a83c6e04c608e1251c1f81ccc634b34b44c9c48698bf' 
  AND token = '/e9irYeMqnyNeE0Hq5PF6gpmbN4b+wPGWu3uoYSnu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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