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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8a4e941d0673d4c89df8f14a65939610f426e62b4735fe42c7ea814fe944ca' 
  AND token = 'sVYL4kVjFnvR3oPy7FLDZx/k+/9+z0CiC2SsEKr8n+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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