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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd564801781bb6c933a5c7c0a8b67597187c2bd1580d86dab645dcd64a79d343e' 
  AND token = 'I/FoZAkNGPoRj+xvVR1WiT20tCUvV7DEiXrsrNSHD6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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