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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6740a6fbddbe897d1aeef2b431802e2ebce8de8766e4a98b173f9883c10f3c12' 
  AND token = 'iEciwIB5QbRKn7wWcnwB3s5Dvy/uYW9PlHFZ5bp1B/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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