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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cff11a6b42e17f7dad897d7de2726d45665bdcd0cb7ad7ac0d9958cba997bc' 
  AND token = 'WtP5ei41FQVrNXtVbAJPCnObzoxfYDgP730aS/FCe4k=' 
  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"
    }
  }
}