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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f6d4481a96c91ffa8504e77db65ee9afc9e29343ed0073de1b0dc2cef42740' 
  AND token = 'NjRVOjUYE1KPEjPBPhdCOr8WG8n6ppYeyki5/NcQt9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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