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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b464e2edc9d09acc83dd6f12d27613cbaf937c6df9c60d1199b4f66b6b6205c2' 
  AND token = '1w4ttH6tAb+w/9W13Mz8ggZIAWgVmqmRRo51AW50phE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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