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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84767655f89a12b0a390c973f314a481799ce44f66ec72b093e7c90886de27b' 
  AND token = 'v88fXCM5dHi6gQngaRKZgUmHFW/Kfdp8e28zOybFZg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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