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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68991ecc3c9de8172372ba075a7cbee73ac22d12032df97716a5f97d11368ece' 
  AND token = 'dF4zpJxKlqxlFw9KVYJPLxOHC9F64ov4gYg+b7StveE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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