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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de9e247c1b1e372d0a27f303696533f51e56c600181e0a5999e5f88ff8c58a6' 
  AND token = 'XtysGu6UMLpzM+JfS5UozQGrM4A2zCIlMjmIeZZwUSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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