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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e727f112ff3d17db5fbde8a94f12a20f27d49e3529bd7f1ab72fbc76454d6f5' 
  AND token = 'tP6yJf/mSXFEPfgeEAsktm1wZfEsV+wdw7+Rs5It44w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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