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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a28c678268159c9848926ee12d19beb3ebed3ae6e466c88c0c559d1d21a386d' 
  AND token = 'YsL37DrzIY27BHFuz4hR5FPt/IENmyewyuZzrT2JCJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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