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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6bbec9fe97207b3ce9ab4f2e3bf4a5389f969b91e2ac498ce16a63e98d057b' 
  AND token = '461THv09k+XlSA42CPJwkU2lofUascU7szkfDKLgNBU=' 
  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"
    }
  }
}