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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1afa0a1de0ab9a483c3b0c1a24303ce9ae494e0065d564138b688c10351a90' 
  AND token = 'p3oxtyr3uCpIGxe7gFFXyFKGrI6UD8qun+UleyhNayQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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