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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55c3ee493e05b209f0400c3ad6cc7272773fa3b84eed77e474f62c16e56ffc1' 
  AND token = 'NHE5bcdxFkZwPqvJ5KxEmIppuZ4ywfsFE695PZDaNaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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