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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eb2f0f362d0ae5ce4cd21b62a164f8b31e0c8d9fdc4983d0b406eff92713ca' 
  AND token = 'S6AfXdQv7f94Zzc8Q6wXhZKnHfCFZBx2Y8m7mqy2MIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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