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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba39212dec9254b222962066fb83274ecc0ba2b75f1db3c161c6690a7e7eff7d' 
  AND token = 'LIoK6LrWBq4XWg+U8qvk5MhcfNv6rEOiMrGHW0oPTjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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