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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75b0a0538bba061dd73e1c71accd04ad89be483f37a33900c91f66e2aa8295c' 
  AND token = 'tARVcincKj6fp1G4BKBvFWYAppuxHSPVkDFrDGVgczU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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