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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2783904c191824b300370cf0bb804f6725e38c3d7ec9547fae3e5ec1ae06568f' 
  AND token = 'dAlidj/LvFpkRTXPLozhU1sHKh4SChwMbdd5cQPFxCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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