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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53379f1c4df5ef099e30f28fd76e99e8fcc4e1d7d9b8d383b3a2aa0cbe74cdfc' 
  AND token = 'xsk/NdGBIcKfWPeA9MmBD353tKxhaAv7Zzd5PyJhHHo=' 
  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"
    }
  }
}