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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da944152bb40a38c9f3493644aeaf92b83a82cb31af55b6b0fe0fee32d0f54fa' 
  AND token = 'IMKY5GTjb0AShQBU+X+uk+1bDgcOR0UxYZ+cs5F++hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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