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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f323d53a888867181c3cf8b1fd94fab72d35adb67afe3d29d1bea415912715e' 
  AND token = 'rrc1T1ACjUMgN1x8KWDV39SLMWPSdHv2O5rrqGK+YB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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