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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5555fdfdc182cfd7d77c3acb03ebe3eb2d15dc73ba33f69bede28b8f33db7b8b' 
  AND token = 'fyQq+9ttqNqvgsLmNbIq6Jf/NFxSt33MzGrh81PXHoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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