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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c984161d4aa2db205f47f06c9d159c11c1f3281d3dce7c8d8a4a36a7d103b34' 
  AND token = 'zhRTH63wEgOi2hZLscDXR7sZsZ8Qf3XMSFX7XGaf1ng=' 
  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"
    }
  }
}