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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4244491f9a454e2c4f83ac2d9ed15a58ac1222a665f818b21838300b4bc5328' 
  AND token = 'dJrgwoVZLV4Tn5lD2tMli/TWr5uLAJU3G3WKZznLe3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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