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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4ec23bdf640deba21a2db8dc2fe2e52cbc2eff575c7533dceb08582f97be4f' 
  AND token = '/WN4wE0CRL+rt8oQg71tjs80AbaGp0swwBduqIkbLnA=' 
  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"
    }
  }
}