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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04c1717dc1fead8bf09cbc6f8a0ad8b3dd0541de0a9236e1ef9ba2c73705393' 
  AND token = 'ipexGi1MqMjKjAq+/uCHy8scs/A/j0XHdYpvG/E61S8=' 
  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"
    }
  }
}