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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b68849dc1c03bb314716c4851af3a75ebe5d95cc1dbba0ff65b7208d94df44f' 
  AND token = 'eCjZHdrrd79I5FbBXWe6iQ9ASN0cadcEzqboRKS33pE=' 
  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"
    }
  }
}