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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57db19354bfec751a736a2a34b01dcda3031ac3a1d16321645896477f8b1c85' 
  AND token = '3FHH/kuz7Al4PIxdCooOJ0PQjGoo1AE0bjLfWeuTBwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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