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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063506851a86b3e35e2d5496fb69fd72c6c804652b9e658adb0c7919b81d2f1' 
  AND token = 'FDcsZuiA29bf49p8fZHnD4iBdOX4GqvFvdaCvg/UXug=' 
  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"
    }
  }
}