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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68d14b5e4bbb9fc27c8a88fb9a06e364ff40bff4a0d4814681c726d597708d9' 
  AND token = 'dPD581PS1isY/buHJvKxJOffPVID99HuZwSGzVeidQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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