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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e5d63340d84c92fd4e426d3126752c9363ce9f2007c2f22c8c2e432fb5c85a' 
  AND token = '2RzzZiPNrliXT/cRwpDa874hndrOVoxZK8qh0rQSBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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