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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319c77a50e5775618ae75ea56eb273cd9c34b508ed215a9bbb0f1b21e12cfaa1' 
  AND token = '+ltubds7an3tlx5p4DF50+LEBvv150yjjgIgHMyLHmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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